Halong Bay is the most well-known tourist destination in northern Vietnam. The bay administratively belongs to the area of Halong City, Quang Ninh Province. It covers 1969 islets (most are limestone), spreading over 1553 sqm. Lan Ha Bay is another sought-after attraction for both domestic and international travelers. Cat Ba Island is 16km away from the bay. See the best of the Lan Ha Bay and Halong Bay in just one day on this cruise, which can be booked with or without transfers from Hanoi. You'll spend roughly seven hours cruising the beautiful area, with stops along the way to swim and kayak if you choose. Other onboard activities include a cooking demonstration, an included lunch of Vietnamese food, and a sunset party.